Question

PART 1 of 3:

Consider two ionic compounds that dissolve fully in water at room temperature. You an experiment and determine the following:

* Compound A has stronger solute-solute attractions than solute-solvent attractions.

* Compound B has stronger solute-solvent attractions than solute-solute attractions. Which of the following best describes the ΔH solution for Compound A and Compound B, respectively?

ANSWER CHOICES:

1.) Both processes are endothermic, but Compound A is more endothermic

2.) Exothermic, endothermic

3.) Both processes are exothermic, but Compound B is more exothermic

4.) Both processes are equally exothermic

5.) Endothermic, exothermic

6.) Exothermic, exothermic

—————————————————

PART 2 of 3:

Which of the following statements is/are true?

I. The activity of a substance measures how its free energy changes with the progress of the reaction.

II. The activity of a solid or liquid is equal to 1. III. The value of the equilibrium constant, K, for a spontaneous reaction is negative.

IV. The equilibrium constant, K, is dependent on the activities of the products and the reactants.

ANSWER CHOICES:

1.) I only

2.) I, II, and IV only

3.) II only

4.) I and II only

5.) I, II, III, and IV

6.) I and III only

—————————————————

PART 3 of 3:

Two liquids mix spontaneously at 180°C. At room temperature, the liquids separate into two layers instead of mixing. Which of the following is true for the process of mixing at room temperature?

ANSWER CHOICES:

1.) ΔG < 0

2.) ΔH < TΔS

3.) ΔS < 0

4.) ΔH < 0

5.) ΔH > TΔS

Answer 1